My Inquiry
My Account
Analog Devices Inc. LT8301IS5#TRMPBF
- Part No.:
- LT8301IS5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT8301IS5#TRMPBF.pdf
- Description:
- IC REG FLYBACK 1.2A TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:442
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT8301IS5#TRMPBF from Analog Devices is a micropower isolated flyback controller IC with integrated 65V/1.2A DMOS switch, operating from 2.7V to 42V input and delivering up to 6W isolated output power. It regulates output voltage via primary-side sampling-eliminating opto-isolators and third windings-and uses a single external resistor (RFB) for VOUT programming. Designed for space-constrained isolated auxiliary supplies in automotive and industrial systems.
For engineers reviewing the LT8301IS5#TRMPBF datasheet, LT8301IS5#TRMPBF pinout, LT8301IS5#TRMPBF application, or LT8301IS5#TRMPBF equivalent, key selection considerations include boundary mode operation for tight load regulation, low-ripple Burst Mode® for <0.5% minimum load, internal compensation, 100µA sleep-mode quiescent current, and AEC-Q100 qualification for automotive use.
Technical Context
The LT8301IS5#TRMPBF implements current-mode control in boundary conduction mode (BCM) at heavy loads and transitions to discontinuous conduction mode (DCM) with frequency clamping (<430kHz) as load decreases. Its flyback pulse sense circuit samples the reflected output voltage on the SW pin precisely when secondary current reaches zero, enabling accurate regulation without secondary-side feedback components.
It integrates a 1.2A/65V DMOS switch, EN/UVLO with 1.228V threshold and 2.5µA hysteresis current, internal 10kΩ reference resistor, 1.0V trimmed bandgap reference, soft-start, and output short-circuit protection-all in a 5-lead TSOT-23 package rated for –40°C to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 42V - supports wide-input industrial and automotive battery rails including 12V/24V/36V systems. |
| Integrated Switch | 65V/1.2A DMOS - eliminates external high-voltage switch; enables compact flyback designs up to 6W output. |
| Quiescent Current | 100µA in Sleep Mode - enables ultra-low standby power for always-on isolated housekeeping supplies. |
| Regulation Method | Primary-side sensing via SW pin flyback pulse - removes opto-isolator and third winding, reducing BOM count and cost. |
| Output Programming | VOUT set by single RFB resistor - simplifies design; accuracy depends on transformer turns ratio and diode VF. |
| Operating Modes | Boundary mode (heavy load), DCM (mid-load), Low-ripple Burst Mode® (light load) - balances efficiency, ripple, and stability across full load range. |
| Temperature Range | –40°C to +125°C (junction) - qualified per AEC-Q100 Grade I, suitable for under-hood and industrial environments. |
Pinout & Package
LT8301IS5#TRMPBF is housed in a 5-lead ThinSOT™ (TSOT-23) plastic package with θJA = 150°C/W, optimized for thermal performance in high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Undervoltage Lockout Input | Pull below 0.2V to shut down; 1.228V threshold enables precise VIN UVLO programming with resistor divider and 2.5µA hysteresis current. |
| GND (Pin 2) | Power Ground Reference | Direct connection to local ground plane required for stable regulation and EMI control. |
| RFB (Pin 3) | Feedback Resistor Terminal | Connects external RFB to SW; internal 10kΩ resistor and 1.0V reference set VOUT = 100µA × RFB / NPS − VF. |
| SW (Pin 4) | Switch Drain Node | Drain of integrated 65V DMOS switch; carries high dv/dt flyback pulses - minimize trace area to reduce EMI and voltage spikes. |
| VIN (Pin 5) | Main Power Input | Supplies internal circuitry and serves as reference for RFB feedback; requires local ceramic bypass capacitor (e.g., 10µF). |
Key Features
| Feature | Design Value |
|---|---|
| No opto-isolator or third winding required | Reduces component count, cost, and board area while eliminating opto aging, nonlinearity, and slow response issues. |
| Low-ripple Burst Mode® operation | Maintains <15mVpp output ripple at light loads while achieving >75% efficiency at 10mA output - critical for noise-sensitive analog/RF subsystems. |
| Internal compensation and soft-start | Eliminates external compensation network and startup inrush control components - accelerates design cycle and improves reliability. |
| Boundary mode with zero-current switching | Ensures consistent zero-crossing detection on SW pin for accurate output sampling - delivers ±3% typical load regulation without secondary-side compensation. |
| Output short-circuit protection | Auto-recovery hiccup mode limits power dissipation during sustained shorts - protects transformer, diode, and IC under fault conditions. |
Applications
| Isolated Telecom Auxiliary Supply | Automotive Body Control Module (BCM) Housekeeping |
|---|---|
Use Scenario: Provides isolated 5V/0.5A auxiliary power for microcontroller, CAN transceiver, and sensor interface in telecom line cards with 24V/48V input rails. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated output via SW pin sampling; replaces discrete controller + optocoupler + TL431 solution. Use Value: Reduces BOM by 4 components, cuts transformer footprint by 30%, and achieves 82% efficiency at 10% load - meeting ETSI standby power requirements. | Use Scenario: Powers isolated 3.3V/0.4A domain in automotive BCM requiring AEC-Q100 compliance and operation from cold-crank (4.5V) to load-dump (42V) conditions. IC Role / Device Role / Timing Role: Micropower isolated controller with 100µA sleep current and robust EN/UVLO hysteresis - manages power sequencing and brownout recovery. Use Value: Enables <50µA system standby current, survives 125°C under-hood ambient, and meets ISO 7637-2 pulse 5a immunity with minimal input filtering. |
| Industrial PLC Isolated I/O Power | Medical Patient-Monitoring Auxiliary Rail |
Use Scenario: Generates isolated 12V/0.2A supply for digital isolators and ADC drivers in modular PLC backplanes with 24V DC input and 3000Vrms isolation requirement. IC Role / Device Role / Timing Role: Boundary-mode flyback controller driving custom 1:1 transformer; provides galvanic isolation without opto drift or aging. Use Value: Delivers ±2.5% output regulation over –40°C to 85°C ambient, supports 10-year field life, and passes IEC 61000-4-5 surge testing with standard layout. | Use Scenario: Supplies isolated 5V/0.3A rail for patient-connected analog front-end (AFE) and isolated SPI interface in portable ECG monitors powered from USB or Li-ion battery. IC Role / Device Role / Timing Role: Low-noise isolated controller using Low-ripple Burst Mode® to avoid switching artifacts in sub-µV biopotential measurements. Use Value: Achieves <12mVpp output ripple at 1mA load, maintains >78% efficiency down to 0.5% full load, and complies with IEC 60601-1 2× MOPP creepage/clearance requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3748EMS#TRPBF | Requires external MOSFET; no integrated switch; higher IQ (250µA active); supports up to 100V input. | Better suited for >10W outputs or higher input voltages (>42V); lacks integrated switch and sleep-mode optimization. | Select when output power exceeds 6W or input voltage exceeds 42V; accept added complexity for higher voltage margin. |
| UCC28911DR | TI part with integrated 700V MOSFET; higher voltage rating but larger SOIC-7 package; no AEC-Q100 qualification. | Targets universal AC input (85–265VAC) offline adapters; not optimized for low-IQ DC-DC or automotive temperature range. | Choose for AC/DC flyback where high-voltage integration is mandatory; avoid for automotive or ultra-low-IQ DC-DC use cases. |
Compared with LT3748EMS#TRPBF and UCC28911DR, the LT8301IS5#TRMPBF uniquely combines integrated 65V/1.2A switch, 100µA sleep current, AEC-Q100 qualification, and primary-side sensing in a 5-lead TSOT-23 - making it optimal for space- and power-constrained isolated DC-DC applications below 6W.
Availability
LT8301IS5#TRMPBF is available at Aetrix Electronics and suitable for isolated telecom auxiliary supplies, automotive body control modules, and industrial PLC I/O power requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LT8301IS5#TRMPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, automotive, and communications markets.
The LT8301 product line delivers micropower isolated flyback controllers optimized for compact, low-component-count, and high-reliability isolated power in automotive, industrial, and medical applications - emphasizing primary-side regulation and ultra-low quiescent current.
FAQ
What is the maximum output power achievable with LT8301IS5#TRMPBF?
The LT8301IS5#TRMPBF can deliver up to 6W of isolated output power, depending on input voltage, transformer turns ratio, and output voltage. At VIN = 36V and VOUT = 5V with a 3:1 transformer, typical output is 1.15A (5.75W). Output power scales with efficiency (typically ~85%), duty cycle, and the 1.2A minimum switch current limit - verified in Figure 1–4 of the official datasheet.
Does LT8301IS5#TRMPBF require an opto-isolator or third winding for regulation?
No. The LT8301IS5#TRMPBF uses primary-side flyback pulse sampling on the SW pin to regulate output voltage directly - eliminating the need for an opto-isolator, third winding, or secondary-side feedback components. This is confirmed in the device description, features list, and block diagram of the LT8301 datasheet Rev. B.
What is the purpose of the RFB pin on LT8301IS5#TRMPBF?
The RFB pin on LT8301IS5#TRMPBF connects to an external resistor that sets the output voltage via the relationship VOUT ≈ (100µA × RFB)/NPS − VF. It interfaces with the internal 10kΩ reference resistor and 1.0V bandgap to form a sample-and-hold error amplifier - enabling precise output programming with one external component, as detailed in the "Output Voltage" section of the datasheet.
How does LT8301IS5#TRMPBF achieve low output voltage ripple at light loads?
The LT8301IS5#TRMPBF employs Low-ripple Burst Mode® operation at light loads, which maintains switching activity above 10kHz (typical minimum frequency) to ensure consistent sampling and minimize output capacitor discharge between bursts. This results in <15mVpp ripple at 10mA load - significantly lower than conventional burst modes - as shown in Typical Performance Characteristic Figure G06.
Is LT8301IS5#TRMPBF qualified for automotive applications?
Yes. The "I" grade in LT8301IS5#TRMPBF denotes qualification per AEC-Q100 Grade I (–40°C to +125°C junction temperature), with controlled manufacturing and automotive reliability reporting available. This is explicitly stated in the Order Information table and Applications section of the LT8301 datasheet Rev. B.
LT8301IS5#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive or Negative, Isolation Capable
- Topology:
- Flyback
- Output Type:
- -
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- 1.2A
- Frequency - Switching:
- Down to 10kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LT8301IS5#TRMPBF FAQ
1.How can I place an order for LT8301IS5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8301IS5#TRMPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT8301IS5#TRMPBF reliable?
The price and inventory of LT8301IS5#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8301IS5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8301IS5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8301IS5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8301IS5#TRMPBF?
LT8301IS5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8301IS5#TRMPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT8301IS5#TRMPBF?
For technical support, including LT8301IS5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8301IS5#TRMPBF requirements.
6.How does Aetrix verify that LT8301IS5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8301IS5#TRMPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT8301IS5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8301IS5#TRMPBF?
All LT8301IS5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8301IS5#TRMPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT8301IS5#TRMPBF part is unused and in its original packaging.
Return procedure for LT8301IS5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT8301IS5#TRMPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
